Download and print out your very own scale model of the infamous Hydrasub from Captain America: the First Avenger!
 
Files are scaled to fit most 3D printer build platforms, and can be scaled up or down, depending on your desired model size. As offered, the model builds into a physical submarine that measures 35" in length, 4" in beam, and 11" wide at the widest point. 
 
An overview of the assembly can be viewed here.